These ravens were on top of the monument in a rowdy gang. It was very windy and cool. It looked like the older birds were letting go from the top and then hovering on the updrafts like a kite. When some of the other birds tried (possibly younger) they made a real hash of it either being blown off, or crashing back to the structure. It was great to watch. At one stage one bird seemed to reach out and correct the one next to it.